SORPTION OF HEAVY METALS BY BED SILTS IN THE PRESENCE OF AMMONIUM IONS

UDC 550.47

https://doi.org/10.15407/mineraljournal.38.02.096

V.V. Shkapenko, V.M. Kadoshnikov, E.G. Musich, I.R. Pisanskaya

Institute of Environmental Geochemistry of the NAS of Ukraine

34-a, Acad. Palladina Pr., Kyiv-142, Ukraine, 03680

E-mail: vika.shk@yandex.ru; Nad79eva@bygmir.net

SORPTION OF HEAVY METALS BY BED SILTS IN THE PRESENCE OF AMMONIUM IONS

Language: Russian

Mineralogical journal 2016,38 (2): 96-100

Abstract: The article deals with the sorption of Cu+2, Mn+2, Pb+2, Ni+2, Fe+3 by bed silts, contaminated with oil products (for example, silt bottom sediments of the Sevastopol Bay). The aim of this paper was to investigate the adsorption of heavy metals by silts, contaminated with oil, in the presence of ammonium ions. Aqueous solution containing cations of Cu+2, Mn+2, Pb+2, Ni+2, Fe+3 was used for studies. Determination of heavy metals in the solution was conducted by atomic absorption. The composition of the mineral phase was evaluated according to the X-ray phase analysis. To prepare the working solution we used ammonium chloride (of NH4Cl) of qualification (analytical grade). To investigate the adsorption of heavy metals used in the dried silt bottom sediments of the deep part of the Sevastopol bay. To simulate the natural process of formation of organometallic compounds in the laboratory, special compositions were prepared by simulating the composition of silt of the bottom sediments. Infrared spectroscopic studies have shown that the increase of ammonium ion concentration in the samples increases the formation of organometallic compounds that is evidenced by a decrease in the content of aromatic substances, which correspond to the ring oscillation in IR spectra obtained. It was established experimentally that the presence of ammonium ions in the composition slightly increases sorption capacity of studied compounds. These results confirm the hypothesis that in the process of petroleum transformation organometallic compounds are formed which increase the sorption properties of the experimental compositions of bottom sediments. The increase of heavy metals sorption by silts contaminated with petroleum products is connected with the fact that the natural transformation of oil results in formation of a complex set of organometallic compounds. This process is intensified in the presence of ammonium ions that consequently affects the sorption properties of silts relative to multiply charged cations such as Cu+2, Pb+2, Ni+2, Fe+3. However, the organometallic compounds formed as a result of oil transformation, have no significant effect on the adsorption of manganese, since in the neutral and weakly alkaline medium manganese is advantageously of colloidal or pseudocolloidal form.

Keywords: hydrocarbons, ammonium, heavy metals, biotransformation, bottom sediments, sorption.

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